Method Overriding in Dart | OOP in Dart | Flutter | Urdu/ Hindi |@thecodecollege
OOP in Dart Language | Flutter Programming | OOP in Dart in Hindi/Urdu
Object Oriented programming (OOP) is a programming paradigm that relies on the concept of classes and objects. It is used to structure a software program into simple, reusable pieces of code blueprints (usually called classes), which are used to create individual instances of objects. There are many other object-oriented programming languages except dart that includes JavaScript, C++, Java, and Python.
In this lecture we will discuss about overriding method.
Method overriding occurs in dart when a child class tries to override the parent class’s method. When a child class extends a parent class, it gets full access to the methods of the parent class and thus it overrides the methods of the parent class. It is achieved by re-defining the same method present in the parent class.
This method is helpful when you have to perform different functions for a different child class, so we can simply re-define the content by overriding it.
Important Points:
1. A method can be overridden only in the child class, not in the parent class itself.
2. Both the methods defined in the child and the parent class should be the exact copy, from name to argument list except the content present inside the method i.e. it can and can’t be the same.
3. A method declared final or static inside the parent class can’t be overridden by the child class.
4. Constructors of the parent class can’t be inherited, so they can’t be overridden by the child class.
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What is Object?
Object is an entity. Objects are declared to access functions and data declared in a class.
For accessing the class properties and methods, we use. (Dot) operator.
What Class?
Dart classes are the blueprint of the object, or it can be called object constructors. A class can contain fields, functions, constructors, etc. It is a wrapper that binds/encapsulates the data and functions together; that can be accessed by creating an object.
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